Question

I am writing to a file in C++ using streams by using following code and output is shown following the code. Here I want to format like second column is of size 10 and values should be right aligned in same way for third column as well.

for (unsigned int dvIdx = 0; dvIdx <  3; dvIdx++)
{
    dataFile << myData.TimeChanged().Format().c_str() << "  " <<  myData.GetValue() 
        << "  " <<  myData.GetQuality() << std::endl; 
}


2012-06-25 12:01:04.000  1  1083507713
2012-06-25 12:01:20.000  3  1029
2012-06-25 12:01:36.000  -empty-  2157642752

Expected output is

2012-06-25 12:01:04.000        1  1083507713
2012-06-25 12:01:20.000        3        1029
2012-06-25 12:01:36.000  -empty-  2157642752

How can I change above code to get expected output. Thanks for your help and time.

Answer 1

You must look for <iomanip>, setw and setiosflags

dataFile << myData.TimeChanged().Format() << "  "
         << std::setw(10) << std::setiosflags(std::ios::right)
         << myData.GetValue() 
         << std::setw(10) << std::setiosflags(std::ios::right)
         << "  " <<  myData.GetQuality() << std::endl;